Comment 12 for bug 1821533

Progress! Based on information in dmesg, pasted in at the end of this message, I thought maybe the graphics device was found OK but the laptop was trying to drive an external monitor instead of the onboard display. Sure enough, when I boot without nomodeset option and with an external HDMI monitor attached the system does display to the external monitor with proper 1920x1080 resolution.

What does the "EDID is invalid:" message mean? Why is the driver/module expecting EDID major version 2 and getting 1? Does this have to do with the version of kbl_dmc firmware loaded to the graphics device?

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guest@guest-ZenBook-UX431FA:~$ dmesg | egrep "drm|i915"
[ 3.196687] fb: switching to inteldrmfb from EFI VGA
[ 3.196881] [drm] Replacing VGA console driver
[ 3.210304] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 3.210306] [drm] Driver supports precise vblank timestamp query.
[ 3.212814] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 3.214857] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[ 3.228865] [drm] EDID has major version 2, instead of 1
[ 3.236620] [drm] EDID has major version 2, instead of 1
[ 3.240878] [drm] EDID has major version 2, instead of 1
[ 3.244590] [drm] EDID has major version 2, instead of 1
[ 3.244595] i915 0000:00:02.0: eDP-1: EDID is invalid:
[ 3.244597] [drm] EDID has major version 2, instead of 1
[ 3.290049] [drm] Initialized i915 1.6.0 20180514 for 0000:00:02.0 on minor 0
[ 3.326674] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 3.356268] fbcon: inteldrmfb (fb0) is primary device
[ 4.724973] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device